Operating mechanism fob- swing-saws



W. TAYLOR. OPERATING Mfc'HANxsM Foa SWING sAws.

APPLICATION FILED OCT. I9, 1917.

Patented Sept. 9, 1919. a sHEETs-sHEET l.

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W. TAYLOR.

OPERATING MECHANISM FOR SWNG SAWS. APPLICATION FILED 0cT.|9.1911.

1,315,434. Patented sept. 9,1919. ssHEETs-snsmz. 7 a 26 luv univa r- Tnt: COLUMNA PLANnarzMn cn.. wAsmNu'mN, u. c.

w. TAYLOR.

OPERATING MECHANISM FOR SWING SAWSI-V APPLICATION FILED OCT. I9. 1917.

1 ,3 1 5 ,434. v I Patented Sept. 9, 1919. 3 SHEETS-SHEET 3| s as I 4:',v s? 5P Se 57 I s? @fro/nays rnu summum PLANUURAPH co.. WASHINUTON. D. a.

WALTER TAYLOR, 0F NASHVILLE, TENNESSEE.

OPERATING MECHAN ISM FOR SWINGSAWS.

Specification of Letters Patent.

Patented Sept. 9, 1919.

Application filed October 19, 1917. Serial No. 197,521. f

T0 all whom t may concern: A

Be it known that I, l/VALTER TAYLOR, a subject of the King of Great Britain, residing at Nashville, in the county of Davidson and State of Tennessee,`have invented certain new and useful Improvements in Oper atino' Mechanism for SwingeSaws; and I do hereliy declare the following to be a f ull, clear, and exact description of the invention, such' as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in operating mechanisms for swing. saws and has for its obJect among others to provide one which is of. substantial and durable construction, reliable and eliicient in use.

A further object of the invention is to provide a swinging saw in which mechanical power means is employed to swing the saw through its active stroke, and gravity`operated means for swinging the saw through its inactive stroke.

A further object of the invention is to provide foot operated means for controlling and varying the lbngth of the active stroke of the saw.

A still further object of the invention is toprovide pneumatic means for cushioning the movement of the saw on its inactive stroke.

With these and other objects in view as will appear as the description proceeds, the invention comprises the various novel features of construction, combination and arrangement of parts as will be fully described hereinafter and afterward specifically claimed.

Referring to the drawings:

vFigure 1 represents an end elevation of my improved swing saw, n

Fig. 2 represents a side elevation of the saw Fig. 3 represents an enlarged fragmentary sectional plan view taken on a plane indicated by the line-3 3 on Fig.` 1,

Fig. 4L represents a side elevation of the foot regulator,

Fig. 5 represents a transverse sectional view of thefoot regulator taken on a plane indicated by the line 5 5 on Fig. 4C, and

Fig. 6 represents a similar view showing the method of operating the treadle stops of the foot regulator.

In order that the construction and operation of the invention may be readily understood, I have illustrated an approved embodiment thereof in `the accompanying drawings, and will now proceed to fully describe the same in connection with said drawings, in which 1` indicates a air of upright posts or bars, adapted to e supported or braced in an upright position in any suitable manner.

2 and 3 indicate brackets which are rigidly attached to the upperV ends of the posts 1, and are eachprovided with a lateral eXtension 4 which supports an enlarged bearing 5 at its outer end. `A power shaft 6 is journaled in the bearings 5 and is provided at one end with tight and loose pulleys 7 and 8, and at the other end with a drive pulley 9 which is connected to a larger pulley 10 by a belt -11. This pulley 10 is carried by a driven shaft 12 journaled in the brackets 2 and 3. y I

13 indicates a clutch shaft which is journaled in the brackets 2 and 3 and has keyed thereto a gear 14, which in turn is connected to the driven shaft 12 through the medium of a train of gears V15. A sleeve 16 is mounted on the shaft 13 and carries at its outer end a pinion 17 and at its inner end a clutch 18. 19 indicates a sliding*collarffeathered on the shaft 13 and is adapted to be moved into the clutch 18 to lockthe sleeve 16 with the shaft 13`for simultaneous rotation.

20 indicates a swing saw arm which is provided with the laterally extending arcuate arm 21, which like the upper end of the arm 20 carries a trunnion 22 journaled in the adjacent bearing 5 and `serving to swingingly support the arm 20. An upwardly curved or arcuate toothedarm 23`is carried by the swing arm 20 and meshes with the pinion 17. I

The lower end of the swing arm 20 is formed into substantially U-shape and has journaled therein a stub shaft 211, which latter carries a drive pulley '25 connected tov a pulley wheel 26 on the outer shaft 6 by a belt 27. The other end of the stub shaft 24C carries a rotary saw 28 provided with a guard 29 supported by the swing arm.

A` weight bar SO has one end pivotally connected to the swing bar as at 31 and its other end provided with an adjustable weight 32. 33 indicates a rod having one end pivotally connected to the bracket 2 and theother end pivotally connected to an ear'34 carried Y'by lthe bar 30 adjacen'tits pivot 31.

An air cylinder 35 is mounted on the post 1 and is provided with a relief cock 36. A plunger 37 is slidably mounted within the cylinder 35 and has its plunger rod 38 pivotally mounted intermediate its ends in a bracket carried by the swingarin 2Q as indicated by the numeral 39. The outer end of the plunger rod 38 projects through an opening 40` inthe swing arm 20k and carries an adjustable balance 'weight 41. This cylinder and plunger serve to cushion the swin arm on its inactive stroke.

A sliding shaft 42 is mounted in the brackets 2 and Sand carries a shifter arm 43 which engages the collar 19 and serves to move the latter into the clutch 18. 44 indicates ak collar rigid on the shaft 42 pivotal'ly connected to a rocker arm 45 by a link '46. As shown the rocker arm 45. is rigidly vmounted intermediate its ends on a stub shaft 47 journaled in the cross bar 48 which connects the brackets 2 and 3A at their lower ends. A beveled gear 49 is mounted on vthe rear end' of this stub shaft and meshes with a similar gear 50 carriedV by one end of a rock shaft 51 journaled in sui-table bearings 52 on the rear of the cross bar 48. Y A rocker arm 53 is rigidly mounted Yon the shaft 51 and carries at its outer end at trip pin 54. f

The arm 13 of the swing arm 20 is provided with an ear 55 to which is pivotally connected one end; of a reciprocating arm 5 6 which projects horizontally and rear- .wardly through the slot 57 in the cross bar V48alnd. has pivotally connected to its rear end an angular rack bar 58. As shown the rack bar'isxpivoted at its forward end and has its rear end provided withy a lateral eX- tension 59 which is adapted to normally rest on the bar 56to support the rack bar. The forward edge of the rack bar is provided with a plurality of notches 60` which are adapted to engagethe trip pin 54 to disengage the clutch 18 through the intervening mechanism. Y 61 indicates a push rod which has one end connected to the rocker arm 45 andthe other end connected to the rear end of a treadle bar .62 pivoted intermediate its en'ds in a suitable bracket as indicated by the n'umeral 63, the outer end of the treadle bar being provided with a horizontal foot bar 64 which is disposed in juxtaposition to a foot regulator65." 4

By reference to the drawings and more particularly to Figs. 4, 5 and'G, itwill. be noted' thatthe foot regulator embodies a stepped casing 'which is provided with arecess 66 'in each step. A right angular treadle stop' member 67 is pivotally 'mount'edfwithin each recess and embodies afoot engaging portion G8 and an outwardly curved por tion 69, which is adapted to be swung out beneath and in the path of downward movement of the foot bar 64 when the foot is positioned on the part G8.

` In the present construction of swing saw, the foot regulator is constructed with stops, each of which is designed to regulate and govern the downward movement of the foot bar 64. These four movements of the foot bar correspond to the number and length of strokes which can be given the swing saw. In the operation of the device, and we will say when it is desired to give a short stroke to the saw, the foot bar 64 is pressed downwardly until the foot engages the treadle stop 70 on the .highest step of the regulator. This short movement will in turn rock the rocker arm 45 correspondingly and move the trip pin 54 into a position to be engaged. y

by the notch in the rack bar nearest its pivot. At the same time that the trip pin 5.4 is set, the clutch 18 is thrown in by i'eason of the sliding movement of the shaft 42 which is connected to the rocker arm 45. The instant that the clutch is thrown in, the sleeve 1G with its pinion 17 will begin to revolve, and thereby swing the arm 2 0 out wardly by virtue of the outward movement of the toothed arm 28 connected therewith. At the same time that the arm 2() swings outwardly, the bar 30 will be caused to rise upwardly by reason of the rod 33 connected to it and the bracket 2.

When the arm 20 has reached the limit of its forward swinging movement, the upper notch in the bar 58 will engage the trip pin 54 and swing it inward and through the intervening'mechanism cause the shaft 43 to slide horizontally and disengage the clutch, thus stopping the revolving of the pinion 1 7. As soon as the driving power has been disconnected from the arm 23, the arm 20 will swing back to its initial position by virtue of the weight arm 30 descending by gravity.

ltwill also be noted that by the use of the aircylinder`35, means is provided for cushioning the return or inactive stroke of the swing bar. By the use of the balance weight 41, the plunger rod can be so balanced that should the plunger head leave the cylinder 35, it will accurately enter the cylinder upon the return movement of the swing arm. By the provision of the pet cock carried by the cylinder 35, means is provided for regulating the cushioning eiiiciency of the cylinder.

Should it be desired to increase the length of the stroke of the swing saw, the treadle bar can be pushed downwardly to each succeeding lower step of the regulator, which will in turn correspondingly increase the length of the stroke of the swing arm 20. As the length of the stroke is increased, the trip pin 54 will be swung downwardly to be in a position to be engaged by each succeeding lower notch in the rack bar 58. It is also to be noted that the rack bar 58 is pivotally mounted to the reciprocating bar 56 so that it may swing upwardly to compensate for the arc of movement of the trip pin 54 when it is engaged and swung inwardly of the device.

71 indicates a suitable work bench positioned adjacent the saw and over the treadle bar 62.

While I have described the principle of the operation of the invention, together with a device which I now consider to be the best embodiment thereof, I desire to have it under stood that suc-h changes in construction and arrangement of parts may be made when desired as are within the scope of the appended claims.

Having described my invention, what I claim as new, is:

1. An operating mechanism including a member movable back and forth, driving means, means for connecting said member with said means to move said member in vone direction and including` a clutch, man- 3. An operating mechanism including af member movable back and forth, driving means, and operative connection between said means and member including a clutch for moving said member in one direction, means for returning said member in the other direction, controlling means for said clutch including a manually operable member for throwing in the clutch, a trip connected to said controlling means and adaptedto beset to different positions by said manually operable member, said trip being movable to open the clutch, and means movable with said member to engage the trip at different distances of movement of said member according to the position of said trip, during the movement of the last named means by the driving means, for opening the clutch.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WALTER TAYLOR.

Witnesses:

J. O. BURKE, J. B. TAYLOR.

Copies of this patent may be obtained for ve cents each, by `addressing' the Commissioner of Patents, Washington, D. C. 

